SP-3 is a 300 volt, all-rubber, parallel lamp cord similar to SP-1 but with heavier insulation, and may also include a grounding conductor.
SP-3 designates a light-duty lamp cord rated at 300 volts, similar to SP-1 but with still heavier insulation, and it may also include a grounding conductor. As the heaviest of the SP-1 family, SP-3 provides the greatest durability among these light-duty cords, with the option of a ground for equipment that requires it. The all-rubber, parallel construction maintains flexibility.
The heavier insulation and optional ground make SP-3 the most capable of the SP light-duty lamp cords, suiting it to the more demanding end of light-duty applications. It remains a light-duty cord rather than a hard-service one.
In commercial and industrial settings, light-duty cords like SP-3 serve lamps and small equipment, including those needing a ground, within their rating. Recognizing the designation and its options is part of identifying cord suited to the application.
Because the heaviest insulation and optional ground make SP-3 the most capable of the SP light-duty lamp cords, it suits the more demanding end of light-duty applications while remaining a light-duty rather than a hard-service cord for lamps and small equipment.
At Windy City Wire, the focus on quality low-voltage cable and cord includes light-duty cord types like SP-3. Supplying cord with appropriate construction, ratings, and grounding options helps customers match products to light-duty power needs in commercial and industrial settings.
SP-3 (300 volt all-rubber lamp cord, heaviest, optional ground)
UL (Underwriters Laboratories), which lists flexible cord types